Subject:
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3 sensors = 8 inputs?!
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 7 Jan 1999 03:20:27 GMT
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Original-From:
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Mark Crosbie <mcrosbie@cup&avoidspam&.hp.com>
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Viewed:
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1183 times
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To further the thread on the limitations of having only 3 input sensors:
One of the first things that occurred to me was that three inputs gives you 3
bits of input, which means up to 8 sensors. Depending on which sensors
trigger, you convert that to a binary number which leads you to the "logical"
sensor number.
0 indicates not pressed, 1 indicates pressed.
Input Value Logical Sensor Physical Sensor
A B C
0 0 0 0 front bumper
0 0 1 1 rear bumper
0 1 0 2 left side bumper
0 1 1 3 right side bumper
...
Now, the tricky part is how to build a Lego creation so that different physical
sensors (bumpers, touch switches etc) get mapped to one of these 8 logical
sensor values.
You would need some lever arrangement whereby a bumper triggering could cause
the correct sensor combination to be pressed. It might be easy to do if you
have 4 bumper sensors around the edge of the vehicle. A series of axles and
appropriately positioned levers translate a bumper movement into one of 4
sensor combinations.
Just some thoughts. If I can build it I will post a message...
Mark.
--
Mark Crosbie http://www.best.com/~mcrosbie
Hewlett-Packard MS 47 LA mcrosbie@cup.hp.com
19447 Pruneridge Avenue (408) 447-2308
Cupertino, CA 95014 (408) 447-6766 FAX
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 4 Replies:
 | | Re: 3 sensors = 8 inputs?!
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| (...) Couldn't you do this by simple wire connections? Let's pretend you had a LOT of the motor/sensor connector wires: Sensor #1 is connected to input port #1 hit = 1 0 0 Sensor #2 is connected to input port #2 hit = 0 1 0 Sensor #3 is connected to (...) (26 years ago, 7-Jan-99, to lugnet.robotics)
| | | Re: 3 sensors = 8 inputs?!
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| Mark Crosbie wrote in message <199901070320.TAA020...hp.com>... (...) 3 (...) "logical" (...) This approach can be useful in some applications ofcourse, but theoretically you don't gain more information bandwith. This is because you will be able to (...) (26 years ago, 7-Jan-99, to lugnet.robotics)
| | | Re: 3 sensors = 8 inputs?!
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| Mark, It has been figured out how to get four touch sensors per input. This gives 12 touch sensors if all three inputs are used. Using this approach, a 16 channel Analog MUX can be hooked up. Sensing the four switch lines using Port A and the Output (...) (26 years ago, 8-Jan-99, to lugnet.robotics)
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